Method and apparatus for utilizing heat



A ril 12, 1927 D. s.- JACOBUS ET AL Y METHOD AND APPARATUS FOR UTILIZING" HEAT Filed March 5, 1923 NVENTORS 6&1! ATTORNEYS.

Patented Apr. 12, 1927.

. UNITED STATES f RAE-NT orrice.

DAVID S. JACOBUS, OF JERSEY CITY, AND ARTHUR D. PRATT, OF SHORT HILLS, NEW

JERSEY,- ASSIGNOBS TO THE BABCOCK & WILCOX COMPANY, OF BAYONNE,= NEW JERSEY, A CORPORATION OF NEW "JERSEY.

METHOD AND APPARATUS FOR UTILIZING HEAT.

Application filed March 5,

Uur present invention relates to new and useful improvements in methods and apparatus for utilizing heat contained in preheated, divided, solid, non-combustible material. and more particularly for utilizing heat contained in cement clinker freshly discharged from'a kiln.

The invention resides in the method and apparatus to be more fully described hereinafter and the novelty of which will be particularly -pointed out and distinctly claimed.

The accompanying drawing illustrates,

partly in section, a novel form of apparatus for carrying out our improved method. In the drawing, a hood 1 has a substantially airtight fit over the end of a rotary kiln 200. Extending into the hoodl is a nozzle 2 adapted to discharge into the end of the kiln finely dividedfuel, fed thereto through pipe 3 from the hopper 4, the feeding of the fuel through the pipe 3 being conveniently accomplished by the screw-conveyor 5, driven by motor 6. i

The hood 1 is a continuation of a shaftlike structure or chute 10, having an in- 'clinedportion 11. A grate 12 is advantaon by radiation and convection.

geously located in the upper part of the conduit 10, the purpose of which will be ap- -parent hereinafter. The inclined chute 11 terminates in a passage 13. A chain-grate stoker or conveyor 23 is arranged to receive clinker from the passage 13 and convey it to the discharge passage 24. Above the grate 23 is located a boiler having water tubes 31 disposed above the stoker 23 so as to receive heat from the hot material there- The boiler may be oficonventional type in which the water undergoing evaporation is circulated in tubes 31, as is well understood. A single pass of the air across the tubes 31' 1s preferred. A flue 20 communicateswiththe top of the boiler and with the conduit .10

' through an opening 21 beneath the grate 12.

Enclosing the sides and bottom of the stoker23 is a casingAO, into which air is forced by means of.blower41 throughthe conduit 42. r

In order to mix the heated, air with fuel fed to nozzle 2, we provide conduit to conduct heated air from the hood 1 through a. blower 51 and valve 52 in tube 3.

The apparatus conveniently provided 192's. Serial No. 622,872.

with manholes 61, 62 to give access to the clinker on the grate '12 and on the stoker 23.

The method carried out in our illustrative device is as follows: The incandescent cement clinker from the rotary kiln 200 is allowed to fall through the conduit 10 and strikes the grate-12,. which has the elfectof retarding the passage of the clinker through the conduit. Should the clinker become clogged upon the grate 12, it may be poked or barred through the grate by an operator on the floor 64. the tool being passed.- through the man-hole 61. Passing through thereby. This heated air floWs over the boiler tubes 31, to which itimparts the heat acquired from the clinker. The air then passes through opening 21, through grate 12, and into the kiln 200, Where it enters into combustion with the fuel supplied from nozzle 2. It will be seen that by permitting some accumulation of the intensely hotclinker "upon the grate 12, opportunity-is afforded for the reheating ofthis air cooled apparatus for recovering the waste heat in clinker ,or materials of-a similar nature. It will be seen that by preheating the air by contacting it withthe intensely hot clinker,

we bring itto a state most favorable for high-combustion temperatures. Inasmuch as there is more waste heat available than would be needed for this-purpose, it will be seen that we have provided an efiicient means for utilizingthat excess heat by operating a boiler therewith, the boiler being heatedboth by radiation from the hot clinker and by. .air heated by contact with the clinker.

It will be understood that the apparatus which we have described is merely illustrative and may be varied within wide limits.

vby its contact with boiler tubes 31, and that I We claim: v 1. The method ofutilizing heat contained in preheated, divided, solid, non-combustible material from a furnace, which consists in conveying the heated material from the-furnace which produces it to a point beneath a-bo'iler heating surface to heat the same by the radiant heat of the material, forcing airthrough the material beneath said heating surface and across said heating surface and then into contact with a, portion of said material before it is carried beneath said heating surface and then utilizing the re- .heated air in the furnace producing said heated material to support combustion thereclinker from a kiln, which consists in fore-- ing air through a portion of the hot clinker and over a boiler heating surface, then into contact with another portion of the hot clinker and then into the kiln to support 'a combustion therein, and carrying, the said last-named portion into position to be contacted by the air passing to said heating surface.

.4. The method of recovering heat in hot clinker from a kiln, which" consistsin passing air in contact with said clinker, there:

by heating said air, passin the heated air into contact with a boiler eating surface,

' reheating said air by a second contact with the hot clinker, and utilizing the reheatedair for combustion in the clinker-producing kiln.

. 5. "I he method of recovering heat in hot cement clinker from a kiln, whichconsists in passing the clinker-through a conduit and onto a conveyor, passing anthrough said clinker while on said conveyor, thereby heating said air, passing the heated air into contact with a boiler heatlngsurface, and

thence into contact with clinker passing through said conduit, thereby reheating said air, and utilizing said reheated air for combustion in-the clinker-producing kiln. V

6.- In combination with a kiln, an' enclosed housing for receiving the hot clinker from the kiln, means for passing air into contact with said clinker at a first point in said housing, means for passing said air into contact with the clinker at a second point in said housing, a boiler in the path of said air between said points and means to introduce into said kiln the air reheated by its contact at the said second point.

7. In combination with a kiln. a hood enclosing the delivery end of the kiln, a conduit communicating with said hood and adapted to receive hot clinker from the kiln, a housing provided with a lower and an upper passage connecting said conduit and said housing, means to receive clinker from the said lower passage and conduct it adapted to receivehot clinker "from the kiln,

a housing provided with a lower and an upper passage connecting said conduit and said lower passage and conduct it through the housing, means to force air into contact with the clinkerwhile on said receiving and conducting means and thence through said upper passage to contact with the clinker said kiln, a boiler in said housing disposed in the path of said air, and a grate in said conduit above said upper passage to retard the passage of clinker through the conduit.

-, DAVID S. JACOBUS. ARTHUR D, PRATT,

passlng through said conduit and thence into said housing, means to receive clinker from 

